Reify a recursive data structure into an explicit graph.

Version on this page:0.6.1@rev:1
LTS Haskell 16.20:0.6.3
Stackage Nightly 2020-10-25:0.6.3
Latest on Hackage:0.6.3

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BSD-3-Clause licensed by Andy Gill
Maintained by Andy Gill

Module documentation for 0.6.1

This version can be pinned in stack with:data-reify-0.6.1@sha256:f7f3a5b2f482a67eb77f4ba32e15f91bcfa4c220cdda9dde22cd9d9ff18ab447,3646

data-reify Hackage version Build Status

data-reify provided the ability to turn recursive structures into explicit graphs. Many (implicitly or explicitly) recursive data structure can be given this ability, via a type class instance. This gives an alternative to using Ref for observable sharing.

Observable sharing in general is unsafe, so we use the IO monad to bound this effect, but can be used safely even with unsafePerformIO if some simple conditions are met. Typically this package will be used to tie the knot with DSLs that depend of observable sharing, like Lava.

Providing an instance for MuRef is the mechanism for allowing a structure to be reified into a graph, and several examples of this are provided.

History: Version 0.1 used unsafe pointer compares. Version 0.2 of data-reify used StableNames, and was much faster. Version 0.3 provided two versions of MuRef, the mono-typed version, for trees of a single type, and the dynamic-typed version, for trees of different types. Version 0.4 used Int as a synonym for Unique rather than Data.Unique for node ids, by popular demand. Version 0.5 merged the mono-typed and dynamic version again, by using DynStableName, an unphantomized version of StableName.



  • Fixed warnings in GHC 7.10
Used by 3 packages in nightly-2020-09-21(full list with versions):